白龙江流域地貌演化及其对地质灾害的影响

摘要

The Bailong River Basin is located in the transition zone of China from the first step to the second step, which is one of the areas suffered the most from the geological disasters in China. In recent years, the research has shown that the influence of Qinghai-Tibet plateau uplift on the Bailong River Basin geomorphology evolution is significant. The characteristics of geomor-phology evolution of Bailong River Basin is cascade and differential uplifts;the planation surface, multilayer cave system and the development of river terraces is the direct response to the plateau uplift. The temporal coupling of geomorphic evolution, rainfall and earthquake formed the present disaster chain pattern of Bailongjang earthquake-collapse, slide-debris. The plateau uplift effect is the essential cause for the development of geological disasters. With the further uplift of mountain, the dynamic condi-tions of the geological disaster development will be more sufficient, which will be in a high incidence trend in a certain period, it is a rebalancing process to the geomorphic evolution power.%白龙江流域地处我国地貌第一阶梯向第二阶梯的过渡地带，是我国地质灾害最为严重的区域之一。近年来的研究表明，青藏高原隆升对白龙江流域地貌演化的影响是非常显著的。白龙江流域地貌演化具有梯级、差异隆起的特征，流域内夷平面、多层溶洞系统和河流阶地的发育是对高原隆升的直接响应。地貌演化和地震、降水的时空耦合，形成了现阶段白龙江流域地震-崩塌、滑坡-泥石流链式灾害模式，高原隆升效应是白龙江流域地质灾害发育的根本原因。随着山地的进一步隆升，白龙江流域地质灾害的发育动力条件将更加充分，并在一定时期内仍处于高发态势，这是地貌演化过程中的动力再平衡过程。